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The video shows the models C, Selectric I, and Selectric II. If your typewriter doesn't compare to any of these in the video it is most likely a Selectric III.This will also help:The Selectric III featured a 96-character element vs. the previous
88-character element. IBM's series of "Electronic Typewriters" used this
same 96-character element. The 96-character elements can be identified
by yellow printing on the top plastic surface and the legend "96," which
always appears along with the font name and pitch. The 96- and
88-character elements are mechanically incompatible with each other
(they won't fit on each other's machines) and 96-character elements were
not available in as many fonts as the older 88-character types.

You don't give a make or model, if this a wheelwriter check to be sure the platen is fully seated i the side frames, then gey a littlr WD40 on the front of the print solenoid. if these fail you probably need a print solenoid cap. They are available buy a little tricky to install.